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