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