Consider previous roles and what you've appreciated most about the environment, leadership, values, and growth/development. Think about things that are crucial for you to remain loyal, motivated, work hard, want to contribute, develop as a leader, continue learning, etc. Some common responses might include an ethical leadership team, trust, being a part of something bigger than yourself, making an impact, a sense of having more than a job, the employee benefits package, positive professional relationships, stability, opportunities for engagement and growth, being able to be involved, etc.
Simply share what things are very important to you, and your passion will automatically come through!

"Trust is absolutely important to me. I need my superiors to trust me to deliver the results they want. I also value positive relationships at work. Teamwork is very important to me and I hope to work with people who are committed to serving others and working together towards a common goal. Opportunities for growth and continued development are also things that keep me motivated to always be improving."