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