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Not an ER generation tool but you can refer the ERD's available here for Out of the box schema.
Description of the main tables
Your best bet will be to add you custom schema and create one manually.
Also, this is not exactly what you are looking for, but there is an automated process to generate a data dictionary that will help you understand the struct of your data model.
How to generate a Data Model or Data Dictionary
Thanks,
Pulkit