You can set the color of each group in a treemap using the color parameter:

import matplotlib.pyplot as plt
import squarify # pip install squarify (algorithm for treemap)
# Change color
squarify.plot(sizes=[13,22,35,5], label=["group A", "group B", "group C", "group D"], color=["red","green","blue", "grey"], alpha=.4 )

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