<｜begin▁of▁sentence｜>### Instruction:
As a GIS Specialist working on a project for visualizing geographical data, you need to use the CairoPolygonDrawer in the igraph library to draw a hexagon representing a specific region on a map. You want to save the hexagon as a PNG file to include it in your GIS visualization. Can you guide me through the process of accomplishing this task using the igraph library?
### Response:
import cairo
from igraph.drawing import CairoPolygonDrawer

# Set up the surface to draw
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 400)
context = cairo.Context(surface)

# Create a polygon drawer
polygon_drawer = CairoPolygonDrawer(context)

# Set up points for drawing a hexagon
hexagon_points = [(100, 150), (200, 150), (250, 250), (200, 350), (100, 350), (50, 250)]

# Draw the hexagon
polygon_drawer.draw(hexagon_points)

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