L1 diagram help

I need to draw up a L1 diagram but having some issues starting this as I have never done it before. All google and other searches come up with are crappy examples showing a network layout of a router firewall cloud and 5 computers with straight lines, nothing detailed or with a large amount of devices.

I found this [example](https://packetpushers.net/network-documentation-best-practices-whats-important-how-to-track-it/) under the L1 section it shows him using basic shapes instead of icons. I like the saving of room by putting the info in the shape rather then taking up room outside of it.

Should an L1 layout include the building layout so that if a Ethernet cable goes to a desk show the true path of the cable or is a representation showing that a cable goes to a specific wall plate good enough?

Any other advice would be great!

Thanks