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