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