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