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