Maybe an exercise like this?
Place white pawns on c3, c6, f3, and f6. Then with a white bishop on a1 move to all the light squares on the board (except the squares the pawns occupy). Then do it for a bishop on h1.
If possible I'd try to make parts of this blindfolded. So I'd set up the board in front of me, then I'd look away and write down 1 (or a few) moves. Whatever you're comfortable with. Then make the moves on the board. Repeat until you've visited all the squares. Each time you visualize the moves yourself before playing them on the board.
The notation was pretty straight forward now I've started to read books. The moment I hear a square I know exactly what square it is. But now it's what colour is that square?
I'll feel confident to attempt a blindfold game when I can instantly put a colour to that square as quick as I can move a piece when reading notation.
One method I'm thinking of is to to draw a 64 square board and shade them in everyday, over and over, until it becomes natural.
I'll be interested to hear any better ideas, excluding photographic memory! lol