I would like to display all results which match selected facets even though a search query has not been inserted. Similar to how some shop applications work e.g. Amazon
Look at SearchQuerySet.
This should be possible if color and price has been defined in your SearchIndex:
sqs = SearchQuerySet().filter(color="blue", price__range=(10,100))
You can limit the query to certain models by adding models(Model) to the SearchQuerySet. So if you want to limit your query to the model Item use:
sqs = SearchQuerySet().filter(color="blue", price__range=(10,100)).models(Item)