Whisk together the vinegar, lime juice and mustard. While whisking vigorously, drizzle in the olive oil. Cut the avocados and papayas in half. Remove and discard the seeds and scoop out the flesh using a melon baller. Mix papaya and avocado together in a bowl and toss in the dressing with the chopped cilantro. Season to taste with black pepper and salt. Garnish with lime wedges and cilantro sprigs.