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