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