msinia, I'm assuming by "drawings" you mean scale patterns. The 5 scale patterns of the pentatonic scale are not the only scale patterns for the pentatonic scale, they are just the most common.

As for the modes, they each have one common 6th string root, but disregarding the root, there are 7 scale patterns per mode, but they are common to each mode, so in essence, the modes have only 7 scale patterns total.

The number of 6th string root patterns for any given scale is usually the same as the number of notes within the given scale... Notice that pentatonic scale has 5 notes, and 5 patterns, the modes have 7 notes and 7 patterns.