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