How do I display my hex grid to the player?

I have made a hex grid, mathematically, in my scripts. Unfortunately, the player can not see the grid. What is the best way to display the grid to players? Is there someway I can put it in my Hex class and just have boolean like showHex that I can make it appear and disappear at will? I've read a little about projectors, but that doesn't seem like it'll give me the right functionality. I may be wrong. What I hope to achieve is this:

• individual hexes should be visible, not necessarily the entire grid at the same time

• the color of individual hexes should be able to change color given different circumstances

I'm not asking for a tutorial on how to do this, I just need to know what tool that Unity offers I can use to do this.