Divide it into quadrants. Then you take the first pair from the top left and sew them together. Without taking them off the machine take the next pair in the second row and sew them together. Keep doing that until you get the first pair sewn together for the top left quadrant. Then open the first pair and sew the third square in each row to the second square. Do that for each row and then open them and sew the fourth square to the third one in each row. Do that for each quadrant and then press the seams in each row in opposite directions and sew the rows together. By not cutting the chain between you'll keep all your pieces in the right orientation.