In a large bowl, place the quinoa, cucumber, olives, yellow pepper, red onion, tomatoes and feta, and toss lightly to combine.
In a small bowl, whisk together all of the dressing ingredients. Pour the dressing over the salad and toss to coat the salad evenly with the dressing. Refrigerate until ready to serve.
Salad keeps well in a sealed container in the refrigerator for up to 5 days.