1. It is no failure to move back in with your parents.
Yes, it is stressful. Yes, you will have to make sacrifices and it will really suck trying to get your parents to see you as an adult. However, the money you save will be everything. Soon loans will have to be paid, and that job you thought you'd get will not be there right away. New roommates aren't all they're cracked up to be. At least you know your parents as roommates and the problems they come with.
2. Post your résumé on CareerBuilder and other networking websites.
By this point, you should know the ins and outs of resumes and CV. If you don't, visit your college Career center to fix it up. When I did, I had employers calling me for interviews. While they weren't the exact position I desired, they were still jobs within my field of study and experience.
3. Keep your options open.
You likely won't get that high-paying dream job right off the bat. You'll probably have to start small so apply for internships and entry-level jobs in similar fields or with similar organizations. When you do get a position, don't treat it poorly. Work your ass off so if a promotion comes up more closely related to your passion, you can apply with great references.
4. Don't get down on yourself.
Things won't happen right away, in the right order, or with the right people. Things also won't go your way. It's not anyone's fault and all you can do is keep trying. Eventually it will work out.
5. Make a list.
Follow up with every place you apply. Make a list of potential employers (so you don't forget where you applied) and be sure to call. If you apply at the end of the week, call in the beginning of the next week to make sure they got the application, or ask the employer if they are looking for extra documents like transcripts or references.
*Use the computer excuse. Many applications are online so call and say something like you didn't get the confirmation page. Then, once they confirm they have it, work in how interested or qualified you are for the position.