drawing, plan
圖 centers on a visual representation of an idea or layout: a drawing, diagram, or plan. The two given meanings are closely linked, with 'plan' extending naturally from a drawn scheme.
圖 combines 囗 (enclosure, boundary) with 啚, which likely contributes the sound and relates to a map or diagram. The character originally referred to a map or plan drawn within a defined area.
The outer 囗 is a boundary, and inside is 啚, which looks like a complex arrangement. Picture a detailed drawing or plan laid out within a marked frame.
For ズ, imagine a zoo map: the zoo plan is a 圖, and 'zoo' cues ズ.