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