<｜begin▁of▁sentence｜>### Instruction:
How can you use CairoMatrixDrawer to draw an adjacency matrix of a simple tree graph with 3 levels and a branching factor of 2?
### Response:
from igraph import Graph, drawing
from cairo import ImageSurface, Context

# Create a graph
g = Graph.Tree(3, 2) # A simple tree for demonstration

# Set up a Cairo Image Surface to draw on
surface = ImageSurface(cairo.FORMAT_ARGB32, 300, 300)
context = Context(surface)

# Initialize the CairoMatrixDrawer with the Cairo context
matrix_drawer = drawing.CairoMatrixDrawer(context)

# Draw the adjacency matrix of the graph
matrix_drawer.draw(g)

# Save the result to a file
surface.write_to_png('adjacency_matrix.png')
<|EOT|>
