PlantUML is useful for diagramming anything from sequences to system architecture to state machines. It's also widely supported in many modern text editors like emacs and VSCode. PlantUML components for AWS are widely available [1]. You may find RealWorldPlantUML a good place to start looking for examples [2].

[1] https://github.com/milo-minderbinder/AWS-PlantUML [2] https://real-world-plantuml.com/