I can see several Graham inscriptions listed for Dundrod Presbyterian Graveyard, but no specific mention of John who died in 1909, however, the following one caught my eye, could he be one of a number buried here?
Family burying ground of John Graham, Legoniel, the family burying ground of William Graham, Carnaugless
[Black Marble Headstone with Iron Surrounding] [WILLIAM GRAHAM, 1891, No Will, 1891-1892]