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