This is easy to solve, right now...
Create a New List, called Colours
Add 8 items to it, each one starting with the '=' character
e.g. =Fruit And Veg
Assign a colour to it, e.g Teal
And so on

Now, in any list, typing '=' brings up a handy reminder of what all the colours are for

I use, since my most-used Supermarket is organised roughly like this:
=Fruit And Veg                           (Teal)
=Fresh Meat Fish Pasta             (Green)
=Dairy Eggs Juices                    (Pink)
=Baking Bread Cakes                 (Orange)
=Store Cupboard                        (Red)
=Household And Pets                 (Purple)
=Wine Beer Spirits                     (Blue)
=Personal                                  (White/No Colour)