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