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