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