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