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