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