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)(11,19)(12,15)(13,17)(14,18)(16,22)(20,23)(21,24) involution — undirected(1,3,6,2)(4,8,5,7)(9,10)(11,20)(12,17)(13,15)(14,18)(16,21)(19,23)(22,24)(10,15)(12,13)(16,20)(17,18)(19,24)(21,23) involution — undirected(1,4,6,5)(2,7,3,8)(1,5,6,4)(2,7,3,8)(9,11,14,22)(10,16,18,19)(12,21,13,23)(15,20,17,24)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.