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