Well, start with the title of the short story in the middle of the page as the main node. Then think about the basic components. Characters are important, so you might have branches for each major character and sub - branches for things like their appearance, personality, and role in the story. Also, consider the conflict. Is it internal (like a character's self - doubt) or external (such as a fight with another character)? And don't forget about the mood or atmosphere of the story. You can represent this with colors or keywords on the mind map.