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