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