I have never read, done or even seen Les Mis, but a quick search on the internet for "Les Mis Libretto" gives me this
Link. There's also a thread on SMNetwork that allows for members to request a script/score/libretto
Here.And finally, I believe if you use the search box in the upper right corner, you should be able to pull up some advice on the subject. For myself, I have used a pencil to Box the note that the cue falls on, then written the cue above the measure. Granted, I rarely work in scores, and tend to only use them for overtures and finales (since I work in ballet and I'm not given scores for some odd reason). I've also found other SMs to use
post-it arrows to point to the exact note, color-code the arrows and just list the Q number on the tab.
There's also a thread on here with advice
from HBelden that I found extremely useful when writing blocking into the score.
A little searching will get you everywhere on this site...