let me help out a bit..
the color tabs, as DadoES says, are more for looks, but there is a slight relation to them.
On this year of Lady K, White= Hot water wash, Redish tabs= Warm wash, Green=warm wash. Blue are all options, along with yellow and Orange tabs. Enzyme and pre-wash are both Warm water.
The Lady K set me and my hubby have(72), Don't have the color coded tabs(I like the looks of them) but have the pasley design, like what is around the timer Dial.
Hope this helps
Rich and Chris