Bring 4 quarts salted water to a boil in an 8-quart saucepan. Add sweet potatoes (unpeeled); return to a boil. Cover, reduce heat, and simmer 20 to 30 minutes, just until fork tender. Do not overcook. Remove potatoes from water, let sit until cool enough to handle.
Peel, halve lengthwise, and slice potatoes 1/4-inch thick. Combine with onion, bell pepper, celery and bacon. Toss with Honey Parmesan Dressing.
Cover and refrigerate several hours or overnight. Toss before serving.
To make Honey Parmesan Dressing: Combine all dressing ingredients in jar with tight fitting lid. Cover and shake well.
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