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