Is it ok to go on vacation after just being diagnosed with cirrhosis?

Better not to. I certainly wouldn't advise it unless your doctor specifically tells you it's ok. You don't want to be "trapped" some place without being able to get to medical care if you need it emergently. Again, check with your doctor first.
Stage of cirhosis. Stage of cirhosis matters. Early stage does not interfere much with daily functions. Advanced stage is crippling.