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)(11,15)(18,22)(20,24)(27,31)(30,32) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,10,13,14)(11,12,15,16)(18,22)(19,23)(26,29)(30,32)(2,6)(3,8)(10,14)(12,16)(17,18)(19,20)(21,22)(23,24)(25,26,28,29)(27,30,31,32)(1,4,5,7)(2,3,6,8)(9,11,13,15)(10,12,14,16)(17,19)(18,20)(21,23)(22,24)(25,27)(26,30)(28,31)(29,32)(1,3)(2,7)(4,6)(5,8)(9,12)(10,15)(11,14)(13,16)(17,20)(18,19)(21,24)(22,23)(25,27)(26,30)(28,31)(29,32) 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.