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