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