This is a great idea and a good way to get to know and build a relationship with your local state employment services personnel. This will also help them provide you with better qualified candidates based on the higher level of understanding they will have of your jobs, the job tasks, and what is required. There is no one prescribed way for conducting these, but I would include in the facility tour a chance for them to shadow one or two of the jobs that you are looking to fill. There are also many local resources who can assist you in organizing this facility tour. These include the U.S. Business Leadership Network, the Employer Assistance and Resource Network on Disability Inclusion (EARN), and your Local Veteran Employment Representative (LVER). I would encourage you to collaborate with them to put together a successful event that both parties can get the most out of.