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