Arduino breakout schematic for FDS100 Photodiode
To draw a reasonably easy to understand schematic you typically have inputs on the left, outputs on the right. Wherever possible arrange voltage domains with low voltage on the bottom and high on the top (this can be hard to comply with at times). 

I've re-drawn a schematic with a few changes you might consider:


Don't drive LEDs with an Emitter follower since you needlessly drop the available voltage. In this case you only have 5V available, and the IR LEDs will be 1.4-2V Vf. I've shown a simple FET low side drive.   
If you don't have symbols for your device you can build your own, but you typically should not mix physical characteristics with schematic symbols. Here I've shown the reverse biased Photo diode with a case connection.  








simulate this circuit &ndash; Schematic created using CircuitLab

Note: I added a sense load resistor (R5) which is shown in the FDS100 datasheet. Since the diode conducts a current relative to the light input, you need a path for this current.