Not sure if you meant in general or just on the black cable, but on the white cable there's the colored hatching...
The problem, and not really on Aurisonics part, is that the black cable was never really part of the plan. It was only due to kickstarter demand that they even did it, on a limited kickstarter basis. They weren't designed ground up to have any marking because the original plan was to have the white cable with the colors. It was really a last second idea.
The real problem is that the white cable, as part of the original plan, is hard to tell which side is which in low light because the colors end up looking the same enough. I was thinking about doing what shotgunshane said and using the chin slider's AS logo to memorize which side is which in low light situations.
Actually, the first renderings (the ones we looked at before investing) showed a black cable and colored tubes. Later, Aurisonics tried the color-coded cross-hatch scheme on black cables, but it didn't work out, so they switched to white.