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)(20,27)(22,28)(24,30)(26,31)(29,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,10,13,16)(11,15,12,14)(17,18)(19,22)(20,24)(21,23)(25,28)(26,29)(27,30)(31,32)(2,6)(3,8)(9,11,13,12)(10,14,16,15)(17,19,20,25,21,26,27,31)(18,22,24,28,23,29,30,32)(2,6)(5,7)(18,23)(22,29)(24,30)(28,32) involution — undirected(9,12,13,11)(10,15,16,14)(19,26)(22,29)(25,31)(28,32)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.