Hi Uday! I'm seeing this document is in the account you're writing in from. Can you please clear your cache and cookies and make sure you're logging into this correct account? This is oftentimes the reason for not being able to see a diagram in your account.
I also noticed the first page of your doc is blank. If you're meaning that you can't see the work on the diagram, click on the "Page 2" tab at the bottom to see your content.
Let me know if this doesn't help!