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