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