In large bowl, combine jicama, oranges, onion and cilantro; mix well. In small bowl, combine sweet-and-sour sauce and vinegar; mix until well blended. Pour over jicama mixture; mix lightly. Serve immediately, or cover and refrigerate until serving time.
Just before serving, add salad greens; toss gently. If desired, garnish with halved scored orange slices and cilantro sprigs.