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