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