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