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