Hi,

\showframe
[
  labels=on,
  measurements=on,
  color=red,
]

Would produce an image similar to the attached, but with the black
lines drawn in the specified colour.

Using labels=on would show the names of the items that can be changed
with \setuplayout.
Using measurements=on would show the values for each of the items.

I don't know if there is any value separating the measurements from the labels.

Thank you!