The phrase "few different colors" means a small number of distinct shades or hues. It suggests that there are not many variations in color, but rather just a handful of them.
Anker's PowerLine Lightning cable comes in tons of different lengths and a few different colors. (businessinsider.com)
As for your safety, the Shower Pass Club Pro comes in a few different colors, all of which are extremely bright and readily visible even at a distance, and even in low light, rain, fog, or other reduced visibility circumstances. (businessinsider.com)