This can involve as much creativity, or as little, as you want. Draw it and take a photo. Make a chart in Microsoft Word. Create an elaborate infographic. Whatever you prefer.
Construct a relationship tree/chart and demonstrate the relationship between the disciplines that you have intend to focus on as part of your Interdisciplinary Studies degree. How are they related? How do they connect together? What larger areas are they part of? Use the disciplinary trees that I provided as a model and to help you think out these relationships.