unfortunately there is currently no visualization for the mesh module.
I have used PyVis which actually shows only the sending and receiving Nodes and not the intermediate Nodes of a Data-Transmission because it is based on IP-Layer and Mesh is based on Layer2 Routing.
But this gives a Basic Idea of the Topologie, mobility of Nodes and somehow mgt-traffic.
I guess it is the same with NetAnim which I have not really used for while.
As stated you can glance through some sample netanim codes provided in the example files or tutorials.
best regards,
Christopher