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