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