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