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