I’m attaching my Material Library for the Gweike G2 30W
Gweike-G2Pro-30W-150mm.clb (6.1 KB)
There aren’t many, and I have a weaker laser than you. But it could be a good starting point.
The link Colin posted is a good reference, and be prepared to do some Material Tests.
→ Save your parameters to your own Material Library from the start. This will save you time in the future.
That’s certainly possible to some extent.
I found that the Speed and Interval settings produced the best color differences on stainless steel:
You can import my Material Test Preset here:
G2-Stainless-Interval-colors.lbmt (1.2 KB)
Be aware that this is a delicate process! (The colors are a result of nanometer-scale variations in the oxide layer thickness, which filter some light wavelengths. 
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A consistent focus height is crucial for reproducible results.