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