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