You want to cut the salad earlier than serving, but what worries you is whether it will look like freshly cut and will not start to get moisture from the fridge where you put it. However, there is a little secret and very effective.
So, if you want to prepare the salad long before the meal, all you have to do is not put oil and salt in it. You only throw them when you are about to serve it. While in the refrigerator you place it covered.