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