It’s more efficient to leave your air conditioner running at a minimal level during the day than to shut it off and have to recool the house again later.
The less you use the AC, the less electricity you use. When the AC is running, regardless of the level, you are paying for it; when it is off, you’re not. Keep your windows closed while the AC is off to not let in additional humidity. A well insulated home should only drop a few degrees throughout the day, while you’re not home.