<｜begin▁of▁sentence｜>### Instruction:
As a Volunteer Coordinator for a local environmental organization, you have been tasked with creating a visual representation of the volunteer network structure. Using networkx and matplotlib, how can you plot a tree graph where each volunteer has two assigned tasks, and there are three levels of hierarchy? This visualization will help in understanding the organizational structure and optimizing volunteer management.
### Response:
from igraph import Graph, Plot
from igraph.drawing import plot

# Create a simple graph
g = Graph.Tree(3, 2)

# Define the layout
layout = g.layout('rt')

# Create a plot object
plot_obj = Plot(bbox=(300, 300), background='white')

# Add the graph to the plot and specify vertex size and colors
plot_obj.add(g, layout=layout, vertex_size=20, vertex_color='blue')

# Draw and show the graph on the plot
plot_obj.show()
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