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