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