With the circuit you posted, the diode has no voltage across it, due to the virtual ground on the cathode. If you turn it around, it will still have zero volts across it. Light will cause current to flow, always from cathode to anode (conventional current). If you reverse bias it, photocurrent will flow, and in fact the response will be faster than in the zero bias mode, as in your circuit. The advantage of zero bias is that you will have zero dark current. With reverse bias, you will still get leakage current, even with no illumination.