The Governor shall appoint a State Agency of Vocational Rehabilitation to be composed of seven members, which Agency shall provide for the administration of this chapter. The members of the Agency shall consist of one member from each congressional district and one member at large. The Governor, upon the advice and consent of the Senate, shall appoint the members. The members first appointed having been designated by the Governor to serve for terms of one, two, three, four, five, six and seven years respectively, each member of the Agency thereafter shall be appointed for a term of seven years. The terms of office shall always remain staggered so that the term of one member shall expire every year with appointments to fill unexpired terms caused by death, resignation or disability.