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