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