Graph[{{{1, 5}}, {{2, 5}}, {{3, 5}}, {{4, 5}}}, 
 {{{0, 0}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{0, 1}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{0, 2}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{0, 3}, VertexColor -> RGBColor[0., 0., 1.]}, 
  {{1, 0}, VertexColor -> RGBColor[0., 0., 1.]}}]
