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