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