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