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