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