Not for ethernet. The only standards I’ve seen that are still deployed are for fiber jumpers, where multimode is orange and single mode is yellow. There are different ends for fiber optic jumpers as well, they are also color coded. Experience here goes along the lines of that I’ve always only color coded ethernet based on cable type. CAT5, CAT5E, and CAT6, stranded and un-stranded all have different color sheathing. Even so, this isn’t a standard and is just what we’ve done in one place to keep a grasp on what’s what.