The best option to update your resume after graduating from college is to remove grades of individual courses. Once you've graduated, your degree is more important than your individual course grades, and it's typically advisable to focus on your overall qualifications, skills, and experiences rather than listing grades.
You may also want to consider keeping your volunteer experience if it's relevant, as well as any special skills that could enhance your employability. References can be provided upon request but are typically not included directly on the resume.