How do I have it so that sprites in a group all spawn in random locations only once in the draw function?

I want to have it in my code such that all of the sprites in a group variable spawn in different locations once in the draw function. The problem I am currently having is that since the draw function constantly repeats, all of the sprites are constantly changing positions due to this; and as you can imagine, they are rapidly moving all across the screen.

  drawSprites(toppingsGroup);
  for (var i = 0; i < toppingsGroup.length; i++) {
     toppingsGroup[i].position.x = 600;
     toppingsGroup[i].position.y = random(height);

}