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