That seems similar to my 3 bean salad:
1 (15 ounce) can black beans, rinsed and drained
1 (15 ounce) can kidney beans, drained and rinsed
1 (15 ounce) can pinto beans, drained and rinsed
1 green bell pepper, diced
1 red bell pepper, diced
1 red onion, diced
1/4-1/2 cup olive oil
1/4 cup red wine vinegar
1/4 cup water
Juice from one lime
1 tablespoon salt
2-3 cloves crushed garlic
1/2 bunch of chopped fresh cilantro
1/2 tablespoon ground cumin
1 tablespoon ground tumeric
1/2 tablespoon ground black pepper
1 big dash hot pepper sauce or 1 minced Serrano pepper

Directions:
In a large bowl, combine beans, bell peppers, and red onion.
In a small bowl, whisk together olive oil, red wine vinegar, water, lime juice, salt, garlic, cilantro, cumin, tumeric and black pepper.
Season to taste with hot sauce or serrano pepper.
Drizzle olive oil dressing over vegetables; mix well. Chill overnight, shake up to moisten and serve cold.

Remember flavor GREATLY intensify after chilling, so DO NOT over salt.
Also makes a great wrap in a large tortilla!