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