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