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