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