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