Whoa. I'm using the blue shirt dude in the pic for reference. I don't even want to think about how 7 people fit in there.
The Dragon is about the same diameter as the Apollo capsule, but longer.
The the seating arrangement, you can look it up online to see the details. Of course, everyone is pretty much in a fetal position for the duration, just like Mercury.
/johnny
Whatever you do when space traveling it is wise to avoid wearing red shirts