Coloring of vertex background in Graph()

class LMG(Scene):
    def construct(self):
        vertices = ["a", 2, 3, 4, 5, 6, 7, 8]
        edges = [("a", 7), ("a", 8), (2, 3), (2, 4), (2, 5),
                 (2, 8), (3, 4), (6, "a"), (6, 2),
                 (6, 3), (7, 2), (7, 4)]
        g = Graph(vertices, edges, layout="circular", layout_scale=3,
                  labels=True, vertex_config={7: {"fill_color": RED}},
                  edge_config={("a", 7): {"stroke_color": RED},
                               (2, 7): {"stroke_color": RED},
                               (4, 7): {"stroke_color": RED}})
        self.add(g)
        
        self.play(
            g[("a")][0].animate.set_color(BLUE), # both circle and text change color
            run_time=1
        ) 
        self.wait(2)  
        self.play(
            g[("a")][1].animate.set_color(BLACK), # only the label changes color
            run_time=1
        ) 
        self.wait(2)  

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