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