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