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