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