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