If you’re using a heading that was binded to a collection item, then remember that field is not an HTML element, it’s just a reference field that’s binded to an item on the page. The easiest way to accomplish color changes is to add a color field in your Collection. Let’s say it’s an Authors collection. For each cook, you’ll have a color field for each, one person red, the other blue, and so on.
When you add a heading that’s pulled from a collection, when clicking on the heading, in the styles panel you can see a setting that says “Get color text from”. So you’ll put a color from the color field on that heading. It will give every created block with headings the cook’s respective color (for all).