Different colours are different tones. The first (red) one is 1st tone (flat), and the second (purple) one is 4th tone (falling)
Ah fuck it was right there
Don't forget grey for neutral
Question is already answered, but commenting to add that you can change the tone colours in the settings page, too
That's pretty neat. Didn't know you could change them although I have no idea what I would even change them to
I'm guessing for people with different kinds of colour blindness it could be useful to make the distinctions more prominent. A couple of phones ago I had the colours switched around where first tone was purple and red was fourth. I don't know why, I think cos red to me means fast and sharp, not flat, but have been using the default since then
bro can't pronounce colors 
(seriously though good question wtf is this)
They represent the tones.
So that's how you pronounce colors 
There are several of them. In the picture you posted for example, there are red and purple
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