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