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