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