This seems very specific to their IoT products, so it's weird they gave it such a generic name, like "Diagram Maker", which makes it seem like a competitor for something more generally capable like diagrams.net/draw.io.
This tool is not limited to AWS IoT products even though that is where this tool was born. You can use this tool for rendering any graph like structure like diagrams, flowcharts, etc.
See more details here: https://awslabs.github.io/diagram-maker/why/features.html#da....