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