The man was arrested on Sunday after the child's parents registered a police complaint, police told PTI news agency.
The girl, who was assaulted on Saturday morning, is in a stable condition. Doctors have confirmed she was raped.
Her family lives on the grounds of the embassy, where her father works as a member of the housekeeping staff.
Police said the accused, a driver, is not employed by the embassy. However, he lives with his parents in the embassy's staff quarters...