$ G = MC $ for some cyclic subgroup $ C $. If $ \vert G : M \vert = 4 $ then why $ G \cong S_{4} $?

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Let $ M $ is a maximal subgroup of finite group $ G $, that $ G = MC $ for some cyclic subgroup $ C $. If $ \vert G : M \vert = 4 $ and $ M_{G} = 1 $ then why $ G\cong S_{4} $?