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)(11,12)(13,15)(14,16) involution — undirected(1,3,5,8)(2,6,7,4)(9,11,13,16)(10,14,15,12)(17,18,21,22)(19,23,24,20)(1,3,5,8)(2,4,7,6)(9,10,13,15)(11,14,16,12)(17,18)(19,23)(20,24)(21,22)(2,7)(3,8)(10,15)(11,16)(18,22)(19,24) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,10)(11,14)(12,16)(13,15)(17,19)(18,20)(21,24)(22,23) involution — undirected(1,4)(2,3)(5,6)(7,8)(9,12,13,14)(10,16,15,11)(17,20)(18,19)(21,23)(22,24)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.