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