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