I am a young mech. engineer. I think a good way to be "visible" is to make sure you don't hesitate to speak up. If you are in a meeting and there is something you don't understand, ask! If it's a more in-depth issue, you may want to ask a single individual after the meeting instead of during the meeting. Don't just assume that you'll catch on in time.
In particular, there was a weekly meeting I was invited to after being with my current employer for <6 months. The company has been around a long time and has developed many standards and specific ways things should be done. We were evaluating these and trying to improve the way we do things. Being a young engineer, I wasn't as familiar with the benefits/labor in different processes, cost of different materials, etc. However, while everybody else was discussing I would take notes and make sketches of the items they were discussing. As the meetings progressed, I would bring up what things that we had been discussed, ideas proposed, etc. The president of the company noticed and I was given the job of sending out official meeting notes. Therefore, even though I didn't have the experience to be the "star" at the meeting, I was noticed.
- MechEng2005