It turns out MySQL WorkBench is great for this. You don't need to register with them to download the program. You don't need a MySQL database running for this. I simply followed these steps:
- From the sqlite3 commandline I types .schema which printed the database schema to the console.
- I pasted the schema into a file and saved it
- I used Import from MySQL Workbench to parse the schema and place it on a diagram.
My only complaint with this tool on Mac is that is pretty unstable and crashes on every whim. Save often.