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