I have used this tool with success before https://www.mysql.com/products/workbench/ https://www.mysql.com/products/workbench/ You can tell it to reverse engin

I have used this tool with success before https://www.mysql.com/products/workbench/ https://www.mysql.com/products/workbench/ You can tell it to reverse engineer the db and it will construct diagrams for you. It has good tools for visually mapping as well. And its FREE !!!!!!