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