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