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