Hello, @K V Ashok !
What can I use to graphically map the connections between resources?
There are many visualizations in Azure but the two most popular tools for visually mapping the relationships between resources would be Network Watcher as you mentioned, and an application map from Application Insights:
An application map using Application Insights:
https://learn.microsoft.com/en-us/azure/azure-monitor/app/app-map?tabs=net
Network Watcher topology map:
https://learn.microsoft.com/en-us/azure/network-watcher/view-network-topology
It might also be worth mentioning VM Insights and perhaps Resource Graph depending on what you are looking for:
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