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