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