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