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)(11,12,16,14,15,18,24,23)(13,19,22,26,20,17,25,21)(3,5)(4,7)(6,10)(8,9)(11,13)(12,17)(14,21)(15,20)(16,22)(18,19)(23,26)(24,25) involution — undirected(5,10)(7,9) involution — undirected(4,8)(7,9)(13,20)(17,19)(21,26)(22,25) involution — undirected(11,14,16,18,15,23,24,12)(13,21,22,19,20,26,25,17)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.