This is not exactly a mod in the typical sense of the word, but a preset for ReShade tool. But this is an advanced preset that truly brings out the best colors and depth in the game.
In order to get this preset working, you obviously first need to install the ReShade tool, guide to which can be found here. Then, in the main menu you can select the Colorful ReShade preset file and apply it to your game.
You may also notice a slight performance boost, as your FPS counter will go up a notch. That's the power of the correct video settings provided by this "mod"!