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)(11,15)(12,16)(13,14)(17,18)(19,25)(20,23)(21,24)(22,28)(26,30)(27,32)(29,31)(1,3,4,8)(2,5,6,7)(17,19,20,28)(18,22,23,25)(21,26,29,27)(24,32,31,30)(10,14)(15,16)(18,23)(19,26)(21,29)(22,30)(25,32)(27,28) involution — undirected(2,6)(5,7)(9,11,13,12)(10,15,14,16)(18,23)(22,25)(24,31)(30,32)(3,8)(5,7)(9,12,13,11)(10,16,14,15)(19,27)(21,29)(22,30)(24,31)(25,32)(26,28)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.