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