@ateekt, First of all do me a favor, Please call my boss and tell him to fire me 
From exterior, You can easily tell by it's grille, rims and tail pipes (57 has no tail pipes)
Inside you'd find carbon fiber instead of wood.
oops! Forgot to mention the engine specs, 57S has 6.0L V12 making 604 horses and 738 lb-ft of torque whereas 57 has 5.5L V12 making 550hp (y).
p.s. Ab batao kia mai paas ho gaya 
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