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