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