If you want to change the color of parts of your prompt, you can using the following commands and color values inside the prompt definition.
Available colors
First, get a list of available colors by using the following command:for i in {1..256}; do print -P "%F{$i}Color : $i"; done;

Variable declarations
Next, use the following variables in your prompt setup (PS1 or PROMPT depending on the shell:
%F{118}
(1 to 256)$FG[018]
(1 to 256)$fg[magenta]
(magenta, red, white, yellow, black, blue, cyan, green)