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