The purpose of the admin logging is to provide you with the legally-required logging of who has had access of what customer information. By "legally-required" I mean contractual requirements between you and your credit card company. If you ask them you'll find that they require that there be a record kept of everyone having access to customer information in the event of any reported fraud or other discrepancy.
There is no switch to disable this functionality. The option to purge current data is available in Admin->Tools->Store Manager, and should only be used after doing a backup of the admin-logging data, storing it for future reference as needed. Every two months (or if the log reaches a large size) you will be prompted to do a purge via this method.
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