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