<｜begin▁of▁sentence｜>### Instruction:
Given a palette of colors including 'red', 'green', 'blue', and 'yellow', can you use the CairoPaletteDrawer.draw function from the igraph library to draw and save a horizontal palette strip in a PNG file named 'palette.png'?
### Response:
import igraph as ig
from igraph.drawing.colors import Palette
from igraph.drawing.cairo import CairoPaletteDrawer

# Create a graph
graph = ig.Graph.Tree(10, 2)

# Generate a palette of colors
palette = Palette(['red', 'green', 'blue', 'yellow'])

# Get the Cairo surface to draw on
surface = ig.drawing.cairo.CairoSurface()

# Use the CairoPaletteDrawer to draw the palette on the surface
palette_drawer = CairoPaletteDrawer(palette, surface)
palette_drawer.draw_palette(left=0, top=0, width=200, height=50)

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