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