One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10,15,16)(11,12,13,14)(17,18)(19,26)(20,24)(21,23)(22,27)(25,29)(28,31)(30,32)(1,3,4,7)(2,5,6,8)(9,11,14,10,15,13,12,16)(19,27)(22,26)(28,32)(30,31)(2,6)(5,8)(9,12,15,14)(10,13,16,11)(17,19,20,27)(18,22,24,26)(21,28,29,32)(23,30,25,31)(9,13,14,16,15,11,12,10)(18,23)(21,29)(22,30)(24,25)(26,31)(28,32)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.