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