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