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