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