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