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