How to get the Galois group as a permutation group

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I was trying to convert a Galois group of a number field as a permutation group. I did this:

G=graphs.CycleGraph(5)

L=G.spectrum()

a = L

K, a_in_K, hom = number_field_elements_from_algebraics(a, minimal=True)

K.galois_group()

X.as_permutation_group()

However the last command returns error. Please help