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