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