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