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