This is a sample of a color coded graphghan grid. In the grid, the individual boxes are colored to indicate the color change. Notice that some of the boxes on the first row have x's in them. This is the technique used when you count the number of single crochets (sc) and mark them off as done.
This is what your grid will look like once you have counted across each block. In the process of counting the squares, you can also record the number per color and then crochet from written instructions.