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