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