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