One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,9)(6,8)(7,10)(11,12)(13,18)(14,24)(15,19)(16,21)(17,22)(20,25)(23,26) involution — undirected(3,5,7,6)(4,8,10,9)(11,13,15,22)(12,17,19,18)(14,16,23,25)(20,26,21,24)(3,5,7,6)(4,9,10,8)(11,14,25,22,15,23,16,13)(12,18,21,26,19,17,20,24)(3,6,7,5)(4,9,10,8)(12,19)(17,18)(20,21)(24,26)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.