How do I roll or wrap up pasta into a log-like shape for presentation? How do I roll or wrap up pasta into a log-like shape for presentation? 

Example 1, Example 2, Example 3

  

Do they use some kind of tool to wrap the pasta around?
The answer is in your third picture -- chopsticks.

Grab the bunch with the chopsticks, twirl it around, then slide the chopsticks out.