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)(17,18)(19,22)(20,21)(23,24)(26,28)(27,31) involution — undirected(1,2,4,5)(3,8,7,6)(9,11,13,12)(10,14,15,16)(17,18,20,21)(19,22,24,23)(27,31)(30,32)(3,7)(6,8)(10,15)(14,16)(18,21)(22,23)(25,26,29,28)(27,30,31,32)(1,2)(3,8)(4,5)(6,7)(9,12,13,11)(10,16,15,14)(17,19,20,24)(18,22,21,23)(25,27)(26,30)(28,32)(29,31)(1,3,4,7)(2,6,5,8)(9,10)(11,16)(12,14)(13,15)(17,18)(19,23)(20,21)(22,24)(25,28,29,26)(27,32,31,30)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.