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Have you installed boto, as django-storage has a dependency on boto?
Then you will have to add the following into your settings.py
import os
AWS_ACCESS_KEY_ID = os.environ.get('AWS_ACCESS_KEY_ID')
AWS_SECRET_ACCESS_KEY = os.environ.get('AWS_SECRET_ACCESS_KEY')
AWS_STORAGE_BUCKET_NAME = os.environ.get('S3_BUCKET_NAME')
STATICFILES_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto.S3BotoStorage'
STATIC_URL = 'http://' + AWS_STORAGE_BUCKET_NAME + '.s3.amazonaws.com/'
ADMIN_MEDIA_PREFIX = STATIC_URL + 'admin/'
Then your cache will be stored on AWS S3 itself.
I hope it helps
Note: for security reasons its a good idea to add your AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY as environment variables instead of just writing them down in setting.py directly.
Source:stackexchange.com