Above on the left is this specific forum's search box, and if you type in pinout and then hit return you will find what you need. The HP workstations of this era (xw6400 xw6600 xw4600 etc) used very similar pinouts with slight variations, and there are excellent posts in there where you can see all the variations.
All the important ones will be there for you. Even the wiring colors have been quite uniform. Makes sense they would do it that way.