While there might not be a single right answer for every occasion, some kind of structured approach will beat a mass of undifferentiated pins every time. You could separate the component into e.g. power inputs as one part and each I/O bank into separate parts. Or some other scheme based on what you want to highlight in the schematic. I tend to have multiple symbols for parts like these, and pick the one that seems most appropriate for the case.
Another pet frustration of mine is the habit of some people in drawing logic components. Elementary gates are shovelheads and all else is blank boxes with nothing whatsoever to indicate the inner workings of the chip. Its almost like nobody ever heard of IEC and the symbol presentation standard. Or then it is too difficult to bother - easier to just draw a blank box...
P.S. I attached a couple of often used symbols of mine, familiar to most of you. The left one is a 74595 serial to parallel latch and the right one is one version of a 74165 parallel to serial one. Both are drawn to IEC recommendations. Once you know how the IEC symbology works, you don't really need the data sheet any more. It is all there in the symbol. Take the 595: You can immediately see that there are two 8-bit registers (1D and 2D), bit-connected in parallel, but each with their own control logic (box with narrowed foot on top of each register).
The first one is an8 bit shift register (SRg8). The internal state is stored by the individual elements (D). There is a reset input R (active low as indicated by the arrowhead in the pin, and (rising) edge sensitive shift clock input (first clock - C1) as indicated by the clock symbol > next to the input, and shift symbol -> in the control block.
The second one is an 8-bit data register clocked by input C2 similar to C1, and there is an active low Enable signal that controls the 3-state outputs (indicated by the small inverted triangle next to the first output - implicit repetition if not otherwise indicated). The supply lines, while not strictly a part of the symboil, are there to simplify drawing, and suggest the proper connection by their placement. The 165 works similarly, except here i have separated the control block to make it easier to connect the bus part and control part separately. This version has one weakness, the power pins are laid stupidly because they separate and that should be fixed. But you get the point.