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