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