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