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