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