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