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