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