This is inside in plannedmaterials.ini file which is in map_config.zip
For example in file:
\iGO_Luna\ux\map_config.zip\ui_nextgen\common\mapconfig\day_summer_blue\plannedmaterials.ini you can modify the RGB color code in below paragraphs:

Spoiler: Code:
[default]
color = 0,190,242
contour_color = 237,249,252


guidance_color = 255,98,26, 8
guidance_contour_color = 102,24,0

passed_color = 0,79,102
passed_contour_color = 0,32,41