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