A practical approach to mapping triads comprises four 'nested' chords, each spanning three consecutive strings: ⑥⑤④ / ⑤④③ / ④③② / ③②①. Each successively higher triad root is a 4th above the previous one. With the sole exception of the tritone (augmented 4th) between the IV and the VII chord roots, every chord root is a perfect 4th apart.
In the image above you can see the structure of the four triads in the VII Zone. Below you can see all the triads belonging to a given key. Because the notes are shown as Roman Numerals, you may position the patterns on any fret position. Roman Numeral I indicates the Tonic of the key, no matter which fret or string it's on. Once you've located a specific position to assign the pattern, play them all in the same key, then in another key, until you've become familiar with the patterns in every key.
Here's notation and tablature to play all the patterns in the key of G:
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