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factorio-blueprint-visualizer
A python library to artfully visualize Factorio Blueprints and an interactive web demo for using it.
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Factoriolab is an up to date calculator with a visualisation: https://factoriolab.github.io
I've used a combination of three mods to help planning.
Rate Calculator lets you select an already-built area and shows you its input and outputs, Factory Planner is pretty neat too with its matrix solver.
Both of those in combination with the Blueprint Lab have been great. Build out the base of your factory in it, save a blueprint, then actually build in your map.
https://mods.factorio.com/mod/RateCalculator
https://mods.factorio.com/mod/factoryplanner
https://mods.factorio.com/mod/BlueprintLab_design
These aren't really diagramming, but I hope they can help.
Foreman 2.0 https://github.com/DanielKote/Foreman2 is robust Factorio diagramming app. It's capable of creating rather large diagrams, such as this [1] one of an entire Seablock factory.
Another one I like to use for quick diagramming is Factorio Lab [2], which is a web app.
[1] https://www.reddit.com/r/Seablock/comments/r0w0nl/full_graph...