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