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