Photodiode Array Wiring
You're going to need six copies of the circuit on the breadboard. The output of each circuit connects to a different "ANALOG IN" pin on the Arduino.

There's no problem with sharing +5V and Gnd among the six circuits.

If space is at a premium, you might consider switching to the LTC1051 or LT1053, which are dual and quad versions, respectively, of the LTC1050.