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