Arc-transitive Cayley graphs on non-ableian simple groups with soluble vertex stabilizers and valency seven

In this paper, we study arc-transitive Cayley graphs on non-abelian simple groups with soluble stabilizers and valency seven. Let $\text{Ga}$ be such a Cayley graph on a non-abelian simple group $T$. It is proved that either $\text{Ga}$ is a normal Cayley graph or $\text{Ga}$ is $S$-arc-transitive, with $(S,T)=({\text{A}}_n,{\text{A}}_{n-1})$ and $n=7,21,63$ or $84$; and, for each of these four values of $n$, there really exists arc-transitive $7$-valent non-normal Cayley graphs on ${\text{A}}_{n-1}$ and specific examples are constructed.