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