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