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