Hayman was born in 1904 in Willowbridge near Waimate. He received his education at Nukuroa School and Waimate High School, and left school aged 17 to help on the family farm. Between 1926 and 1945, he worked as a contractor in farming. He was active with several organisations, including the South Canterbury Power Board (where he served as deputy-chairman), chairman of the South Canterbury Federated Farmers, and treasurer of the Methodist Church Trust at Nukuroa. From 1941 to 1949, he was director of the Studholme sale yards.[1]
He was a cabinet minister from 1960 to 1962; Postmaster-General from 12 December 1960 to 2 May 1961, then Minister of Agriculture from 2 May 1961 until 2 January 1962.[3]
Hayman died suddenly of a heart attack on 2 January 1962.[1]