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)(11,12)(13,20)(14,24)(15,18)(16,19)(17,23)(21,22)(25,26) involution — undirected(3,5,7,6)(4,8,10,9)(11,12)(13,21)(14,18)(15,24)(16,19)(17,23)(20,22)(25,26)(3,5,7,6)(4,9,10,8)(11,13,14,23,16,22,15,25)(12,17,18,20,19,26,24,21)(3,6,7,5)(4,9,10,8)(13,22)(17,26)(20,21)(23,25)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.