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