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