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