Bring salted water to a boil. Add barley, reduce heat to a simmer and cover. Cook 25 minutes or until barley is tender. Drain any liquid and cool completely.
While barley is cooking, chop vegetables and place in a large bowl.
Add cooled barley and dressing. Toss well to combine.
Garnish with feta cheese and parsley. Chill 1 hour before serving.