Preheat your oven to 325°F. Liberally prepare 3 9-inch round cake pans with the nonstick method of your choice. (I recommend the parchment method described on p. 17.)
In the bowl of your stand mixer fitted with the whisk attachment, add the flour, granulated sugar, cocoa powder, baking soda, and salt and mix on low speed. Slowly add the oil and buttermilk.
Increase the speed to medium-low and add the eggs 1 at a time, combining well after each addition and scraping down the sides and bottom of the bowl as needed. Slowly add the coffee, vanilla extract, vinegar, and food coloring. Scrape down the sides and bottom of the bowl and mix the batter until just combined. Be careful not to overmix.
Evenly pour the batter into the prepared pans and bake for 20 to 27 minutes, or until a toothpick inserted into the center of a layer comes out clean. Do not overbake.
Let the layers cool in the pans for 10 minutes, then invert onto wire racks. Let cool to room temperature. Lightly cover the cakes with foil or plastic wrap so they do not dry out.