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