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