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