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