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