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