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