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