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