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