This is not exactly a mod in the typical sense of the word, but instead a preset for a ReShade tool. But since this is an advanced preset that truly brings out the best colors and depth in the game, it's still categorized as a mod.
In order to get this preset working, you obviously first need to install the ReShade tool (here's a guide on how to do it). 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 after installing the mod, as your FPS counter will go up a notch. That's the power of the correct video settings provided by this "mod"!