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