Could you narrate the main story about the sannyasi from Madras as told in Chapter 31?

Certainly. Chapter 31 recounts the story of a sannyasi from Madras named Vijayananda. He was on a pilgrimage to Mansarovar and, having heard of Sai Baba's fame, decided to stop in Shirdi for darshan. Upon arriving, he met Swami Somdevji, who discouraged him by describing the immense difficulties of the journey. This left Vijayananda dejected. When he finally had Sai Baba's darshan, he felt pleased, but Baba's mood suddenly changed. As detailed in Chapter 31, Baba instructed the assembly to send the sannyasi away, which caused the new devotee great distress as he did not yet understand Baba's ways.