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