In schematic drawings, it's common for representations of parts to be laid out logically rather than to mimic the physical layout of the part. For example all the data bus pins might be grouped together in order, all the address bus pins in another group, the power and ground pins in another group, etc while on the physical chip they may be laid out completely differently. If the schematic had the pins laid out to match the physical parts, the wiring would be a rats nest that would be a nightmare to follow. This also allows for a single schematic symbol to represent multiple different package types for the IC. The schematic is a visual representation of how the circuit is wired up together, while the pin numbers are provided so you can find the physical pin on the chip that corresponds to the schematic.