This isn't as easy as it seems. After doing all that work, you want to be acknowledged for all the work you have done. You want the casting director to see all your beats and transitions and choices. As crazy as it sounds, the best way to show off your work is by not showing it! You want to fool them into thinking you are so much like the character that you just have it naturally without having to work it. Just like Fred Astaire and Ginger Rodgers made their dances look easy as if they didn't even have to rehearse them, you need to make your audition look just as easy.
How do you do that? Have confidence and trust that after you've done the work you can throw it away and it'll stay with you. Whatever was good work will stay with you. Whatever wasn't good, well, good riddance. Strive for simplicity. Listen and react. Don't push. Relax, have fun and enjoy not knowing what comes next.
Do the work, then throw it away.