You can either pay for a temporary worker permit, or pay the annual registration fee for Wyoming license plates. Depending on how long you will be working in Wyoming and the type of vehicle you drive, sometimes paying for one year of registration fees and receiving license plates can be cheaper than a temporary worker permit, even if you won't be here for the entire year. If you choose to do this, you do not have to surrender your out-of-state plates.
Get an estimate on registration fees, or read more information on temporary worker permits, including who is exempt.