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