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