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