Just assert the chip select line (S/S/ pin to 'LOW' in you case) of the slave device untill all 5 bytes get transeffered from master (atmega32) to slave device.
ok in brief:
1) first assert SS pin low of Atmega32.
2) send 1st byte and wait for x'mit compelete signal
3) send 2nd byte and wait for x'mit compelete signal
4)send 3rd byte and wait for x'mit compelete signal
5)send 4th byte and wait for x'mit compelete signal.
6) send 5th byte and wait for x'mit compelete signal