Nylon, by its very nature, is not easily dyed. You could try boiling it in some RIT fabric dye, but don't expect intense colors. I buy mine precolored. Craft stores carry #18 nylon in many colors. In fact, I bought three different colors today.

Jeff, sometimes solvents are used to assist dyeing. Also, with plastics, pigments can be added to the resin before it enters the filament extruder.

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Thanks JeffH I'll have to check that place out  
The places I know of I can get green in any size and pink and yellow only in size 18.  The one place says you can order other colors but you have to order a minium of 240 lbs at what could be close to $6.00 a lb  
OUCH! Way to much.

SnapCut
     
     Today I purchased some 1/8 inch braided nylon to make a sling with. Just for giggles I pulled out some old vinyl dye that was bought from Napa auto parts years ago. The stuff is "ox blood" color. I applyed some to the nylon by dipping it in, giving it some time to set and wiping the excess off. It did a very good job of dying the nylon, I then cut through the piece that was dyed and check for penetration. Seems that even the inside of the nylon "took" the dye. The end color was very pinkish, not really red and certainly not ox blood. If you can find vinyl dye cheap enough this may be a good option, but going for a very dark shade will most likely give the best results.
     It also got me to thinking that the clear PVC cleaner mixed with a rit dye may work also. I believe that the PVC cleaner is mostly acytone. So....getting a quart of acytone and mixing it with rit dye may also work, but I would sure be careful with the stuff, like all chemicals it can be nasty if not handled correctly.

Hope this helps, let us know if you have any success.


WalkingBird