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