Might want to check that your system is using the correct graphics device, in the System Configuration menu under Display it will have something like DISPLAY.1.CardNameHere... <<<make sure it is using the correct graphics device as most processors have inbuilt graphics which this game can sometimes default to.

Also, if you open the game launcher and click the cog icon (Config) you can try swapping the DirectX mode from whatever it is set to such as DirectX 11 to 9 or the other way around and test to see if that fixes the problem.

You may want to check the official Mac OS and version supported as well.

And maybe if nothing helps above, downgrade the graphics card driver.