Since the beta has been closed, it appears that Bungie has disconnected all Guardian data from our bungie.net accounts, there isn't a way to bring it back unless Bungie decides to do so.
You're not alone, it's the same way for everyone. Bungie hasn't commented if your Guardian in the beta will stay or go for full game launch. Have to wait and see!
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Actually mine shows...the only issue, is my guardian is black and I can't see anything but a ...shadow (if that's what you would call it)
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All your stuff gets reset and I still have ny Gurdian info
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Actually I see a most everybody still shows their guardians and grimoires on their profile. But like the OP, and you, everything vanished for me. I hope we are still registered that we were in the beta.