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