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