I think you're going to struggle with the coloring in its current format... although some behaviors are common between Excel & Tableau, they are different products.
The only way I can think of doing it (and even then, I'm really not sure) is this way
Effectively you create blank cells, and drop items into them, that way you have more control over formatting
But as mentioned, I really don't know, you'll just have to try.
really Excel is the tool for what you want to do...
Best of luck