Digital presentations add the additional element of media to your presentation. It sounds like you need to create a presentation on a single chapter of The Way to Rainy Mountain. Here's how I would do it.
First, start by selecting the chapter you want to analyze. For example, you might choose chapter one, which tells the Kiowa creation story. The purpose of this chapter is to lay the groundwork that will support the rest of the novel. You'll want to pay special attention to things like the many names which the Kiowa people have called themselves and why there are so few members of the tribe. Assess how these themes tie into what's discussed later in the story. Why did the author choose to make this story the beginning of the novel? If you can answer that question, you'll be well on your way to making an excellent presentation.
In terms of media, you'll want to select things that tie into what's being discussed in the first chapter. For example, the author says that "the Kiowas came one by one into the world through a hollow log." Maybe you could include a picture of a log in the forest. You could even add the sounds of the forest to your presentation. By appealing to multiple senses, you can draw the audience into your presentation to a degree that you wouldn't be able to reach without digital media. That should be plenty to get you started. Good luck!