"计划图编制" can be translated into English as "preparation of planning diagrams" or "formulation of planning charts".
"Preparation" emphasizes the process of creating or getting something ready, which is suitable for describing the act of compiling or creating a planning diagram.
"Formulation" implies the act of creating or devising a plan or system, which also fits the context of developing a planning chart.
"Planning diagrams" or "planning charts" are terms that refer to visual representations used for planning purposes.
Depending on the specific context and the level of formality required, either translation could be appropriate. For a more general or technical context, "preparation of planning diagrams" might be more commonly used, while "formulation of planning charts" could be suitable in a more formal or strategic planning setting.