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