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