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Like this maybe

sage: A = algebras.Free(QQ, 'abc')                                                                                                             
sage: elt = 4 * A.monomial(Word('abc')) + 6*A.monomial(Word('a'))                                                                                 
sage: data = [(w.to_word(), cf) for w, cf in elt]                                                                                             
sage: A.sum_of_terms((w[1:] + w[:1], cf) for w, cf in data)                                                                                   
6*a + 4*b*c*a