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