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