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