
To create a Database Model in Visio, we may use Database Model Diagram template, and select the database driver for database management system (DBMS). After searching online, currently, there are BigQuery ODBC drivers to let some applications connect to BigQuery, such as Excel. (Please note, the drivers can be downloaded for free. Queries run using the driver are charged based on how the driver is configured. Besides, Since the 2 web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.)
But as we do not have the test environment with GCP Bigquery, I could not test for you to verify that wether Visio supports this connections. Thanks for your understanding.
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Update -------------------
Currently, we are unable do Data modeling in Visio by connecting to GCP Bigquery.
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