Gliffy diagrams consist of two parts, a macro on the Confluence page and an attachment that the macro refers to that contains the diagram data. It's more likely that the user deleted the macro rather than the attachment.
The easier way to recover is to revert the page change that deleted the macro.
If that's not practical, go to the page attachments and download the Gliffy diagram in question. Then insert a new Gliffy diagram into the page. On the opening splash screen that appears select "Import a diagram" then upload the .gliffy file you saved from attachments. This will bring up a new diagram that you can save back to the page.
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