When you see the end screen after the game is over and you want to make a new one with the same players, you should click on the green button.

Accordingly, the same icon below your account will light up. If each player does this, a new game will start.

If any of the players does not want to go into a rematch, you will see an "X" under his picture. This means that you can't replay the game with the same players.