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