Took my car to a parts store and was told i had a vaccumm leak so now i need a diagram to find the leak

I am assuming they scanned the codes and pulled the code associated with the check engine light? And this is what told them you had a vacuum leak? Is the vacuum leak associated with any type of system like your ac isnt working properly or something or the car is running poorly? You can inspect most of your vacuum hoses without a diagram and you can use a mighty vac to test them to make sure they are good. Just visually inspect them and look for cracked and damaged hoses and replace them.