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