Develop a broad definition of the position and the desired scholarship, experience, and disciplinary background.
Consider including “experience working with/teaching diverse groups/diverse students” as one of your preferred criteria.
Make calls and send emails or letters to a wide range of contacts asking for potential candidates. Ask specifically if they have diverse candidates to recommend.
Make an effort to identify contacts who have diverse backgrounds or experiences.
Make lists of professional meetings, professional societies, members of these societies, etc, and use them to recruit candidates.
Call potential candidates directly to encourage them to apply.
Remember to actively involve your search committee members and delegate specific tasks to them. For example, ask each member of your search committee to call ten colleagues and ask them to recommend three (3) potential candidates.
Above all, remember that at this point your goal is to EXPAND your pool of potential candidates.