One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10,15,11)(12,16,14,13)(17,18)(19,23)(20,22)(21,24)(25,28)(26,29)(27,30)(31,32)(1,3,4,7)(2,5,6,8)(9,11,12,16,15,10,14,13)(18,22)(19,26)(24,25)(27,32)(2,6)(5,8)(9,12,15,14)(10,16,11,13)(17,19,20,26)(18,23,22,29)(21,27,28,32)(24,30,25,31)(9,13,14,10,15,16,12,11)(18,24)(21,28)(22,25)(23,30)(27,32)(29,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.