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