Graph[{{{1, 4}}, {{2, 4}}, {{3, 4}}}, 
 {{{0, 0}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{0, 1}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{0, 2}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{1, 0}, VertexColor -> RGBColor[0., 0., 1.]}}]
