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