Where does it say they can't speak publicly about the case?
"The Kleins were ordered to 'cease and desist from publishing, circulating, issuing or displaying, or causing to be published, circulated, issued or displayed, any communication, notice, advertisement or sign of any kind to the effect that any of the accommodations, advantages, facilities, services or privileges of a place of public accommodation will be refused, withheld from or denied to, or that any discrimination will be made against, any person on account of sexual orientation.'”
It just says they can't continue to publicly declare that their business will refuse service to homosexuals, which is a violation of Oregon law. This is no different than if a business was found guilty of racial discrimination but wanted to keep announcing that they won't serve blacks. The agency here just said that Oregon law prohibits them from refusing service and announcing that they will refuse service to gays.