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