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