To prepare dressing, combine first 6 ingredients, stirring well with a whisk.
To prepare salad, arrange potatoes in a single layer on a microwave-safe dish; sprinkle with 1/2 teaspoon salt and 1/4 teaspoon pepper. Microwave at HIGH 15 minutes or until potatoes are tender. Place potatoes in a large bowl.
Add shrimp and 1 tablespoon dressing to potatoes; toss gently to combine. Add remaining dressing, lettuce, bell peppers, onion, and cheese; toss gently to coat. Top each serving with 1 1/2 teaspoons kalamata olives.