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