Automorphisms of a distance-regular graph with intersection array $\{39,36,4;1,1,36\}$

Makhnev and Nirova have found intersection arrays of distance-regular graphs with no more than 4096 vertices, in which $\lambda=2$ and $\mu=1$. They proposed the program of investigation of distance-regular graphs with $\lambda=2$ and $\mu=1$. In this paper the automorphisms of a distance-regular graph with intersection array $\{39, 36, 4; 1, 1, 36\}$ are studied.