Here are two images of the Position 4 (A shape) Major Scale, within the CAGED System. The first image maps out the scale and highlights the the Root notes. The second image displays the scale whilst highlighting the chord shape found within that scale. Both of these images also display all of the scale degrees – R 2 3 5 6.
How To Practice
Start by playing the chord shape, then the scale, and then the chord shape again. This is to help us internalise where the chord shape falls within the scale. As you play through the scale, start on the lowest Root note, play up to the highest note, back down to the very bottom note, and finish back on the lowest Root note.