<｜begin▁of▁sentence｜>### Instruction:
As a technical illustrator, a client has requested a detailed diagram of a network infrastructure using the `igraph` library for Python. The diagram must accurately depict the various components within the network and include specific polygons to highlight certain structures or areas. To achieve this, you want to use the `CairoPolygonDrawer` to draw a polygon representing a designated area on the graph's visualization. Can you please explain how to accomplish this with the `igraph` library and the `CairoPolygonDrawer`?
### Response:
from igraph import Graph
import igraph as ig
from igraph.drawing import Plot
from igraph.drawing.shapes import CairoPolygonDrawer

# Load graph data
graph = ig.read('graph_data.gml')

# Create a plot
plot = Plot()

# Create a Cairo polygon drawer
polygon_drawer = CairoPolygonDrawer(plot.ctx)

# Define the points for the polygon
corners = [(0, 0), (50, 0), (50, 50), (0, 50)]

# Draw the polygon using the defined corners
polygon_drawer.draw(corners)

# Save the plot to a file
plot.save('polygon_drawn.png')
<|EOT|>
