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