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