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