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