It's very difficult to do bike fit over the internet, and one 56cm frame is not the same as another 56cm frame. Just as an example I have bikes that are nominally 56cm, 57cm, and 59cm, and they all fit me.
Also, what fits you is going to depend a lot on your individual measurements, such as whether you have a short or long torso, short or long arms, etc.
That said, if you're 5'11" and have a cycling inseam (not pants inseam) of 32, a 60cm is very likely too large for you, and a 56cm would likely be the best guess of where you start looking.
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