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)(11,16)(12,14)(13,15)(17,18,22,21)(19,27,30,24)(20,25,23,26)(28,29,32,31)(2,5)(6,8)(17,19,22,30)(18,24,21,27)(20,29,23,31)(25,28,26,32)(9,11,13,12)(10,14,15,16)(17,20)(18,25)(21,26)(22,23)(28,32)(29,31)(9,12,13,11)(10,14,15,16)(17,21,22,18)(19,28,30,32)(20,25,23,26)(24,31,27,29)(1,3,4,7)(2,6,5,8)(17,20,22,23)(18,26,21,25)(19,29,30,31)(24,32,27,28)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.