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