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