The director shall keep, or cause to be kept, correct and accurate accounts of each and every financial transaction of the prison system, including all receipts and disbursements of every character. He shall receive and receipt for all money paid to him from every source whatsoever, and shall sign all warrants authorizing any disbursement of any sum or sums on account of the prison system. He shall keep full and correct accounts with any industry, department and farm of the prison system, and with all persons having financial transactions with the prison system.