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