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