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