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