Hi Veronica,
You can try using api which will create swatch set.
some think like this
import com.day.cq.dam.commons.util.S7SetHelper;
import com.day.cq.dam.api.s7dam.set.SwatchSet;
//Creating swatchset
SwatchSet ss = S7SetHelper.createS7SwatchSet(Resource parent, String name, Map<String,Object> props)
//Adding asset to the swatch set
ss.add(Asset asset, Asset swatch)
;
Create a workflow process step with the above api which will create swatch set for every image upload in DAM. This is available in CQ 5.6.1
API - https://dev.day.com/docs/en/cq/current/javadoc/com/day/cq/dam/commons/util/S7SetHelper.html
-Maruthi