Edit the IPython config file, normally at
~/.ipython/profile_default/ipython_config.py
If the config file is not present - you could generate it with the command:
ipython profile create
It will generate config file with default settings and you could edit them as needed.
Find and uncomment (or change) setting
c.InteractiveShell.colors
Change it to one of the color schemes available (you can see them all listed in the comments)
'Neutral', 'NoColor', 'LightBG', 'Linux'
Save config file and start IPython.