<｜begin▁of▁sentence｜>### Instruction:
Given a list of vertices ['A', 'B', 'C', 'D'] and edges represented by index pairs [(0, 1), (1, 2), (2, 3)], how can you use AbstractDrawer's subclass CairoGraphDrawer in igraph to draw the graph and save it as an image file?
### Response:
import igraph as ig

# Create a simple graph
vertices = ['A', 'B', 'C', 'D']
edges = [(0, 1), (1, 2), (2, 3)]
names_to_ids = {name: idx for idx, name in enumerate(vertices)}
g = ig.Graph(edges)

# Initialize CairoGraphDrawer
drawer = ig.drawing.CairoGraphDrawer()

# Draw the graph to an image file
with open('graph_image.png', 'wb') as image_file:
    drawer.draw(g, target=image_file)

# Alternatively, draw the graph to the screen (requires an active Cairo graphical context)
# drawer.draw(g, target=None)
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