I moved back in with my parents after undergrad, since my grad program is close to their house. It's been great not having to pay rent, but having that independence taken away and feeling almost like a kid again isn't the best feeling.
I think when you are financially ready, to the point where you have enough in savings to cover a few months rent--should you ever lose your job or something unexpected happens--they you can think of making that big jump to independence. Freedom is of course pricey, but once you are settled into your post grad job, it will be worth it to get away. Just make sure that you move out with roommates that you trust and who will add to your independence, not hinder it.