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