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