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