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)(16,22)(23,26) involution — undirected(3,4,7,10)(5,8,6,9)(11,12)(13,16)(14,17)(15,18)(19,23)(20,22)(21,24)(25,26)(11,13)(12,16)(14,19)(15,20)(17,23)(18,22)(21,25)(24,26) involution — undirected(3,5,7,6)(4,9,10,8)(11,14,15,21)(12,17,18,24)(13,19,20,25)(16,23,22,26)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.