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