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Maybe like that

def matrice_morphism(morph):
    """
    Return the matrix of a morphism ``morph``.

    EXAMPLES::

        sage: module = CombinatorialFreeModule(QQ,Partitions(4))
        sage: f = lambda mu:module.monomial(mu.conjugate())
        sage: morphisme = module.module_morphism(f, codomain=module)
        sage: matrice_morphism(morphisme)
        [0 0 0 0 1]
        [0 0 0 1 0]
        [0 0 1 0 0]
        [0 1 0 0 0]
        [1 0 0 0 0]
    """
    return matrix([morph(u).to_vector() for u in morph.domain().basis()])