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