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