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