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