Next think about how you might present your idea!
Your presentation should be ten minutes long – try to stick to this, a presentation that’s too long is a sure-fire way to put your audience off! A good rule of thumb is around 1 minute per slide.

Read: Ten simple rules for effective presentation slides
Naegle KM (2021), PLoS Comput Biol
Read Ten simple rules for effective presentation slides here for ten great tips on how to structure a presentation.
There is nothing wrong with a traditional PowerPoint group presentation but you might want to be more creative!
Think about what kind of presentation will really sell your idea! If for example your idea involves creating communications material these should be front and centre. You could also link to examples of these using a QR code in your presentation.
If you are planning a product or to construct something you could present a mock-up. You might want to record videos or take photos of what your idea might look like out in the real world!

Read:
https://hbr.org/2013/06/how-to-give-a-killer-presentation
You might want to frame your presentation as a story. Imagine someone that might use or interact with your idea. What does their story look like now, and what would it look like with your idea in place?