create a file named ps.sh in /etc/profile.d directory. Add the following line in the file
PS1="\[$(tput setaf 1)\]\u@\[$(tput setaf 2)\]\h\[$(tput setaf 1)\]: \W \\$ \[$(tput sgr0)\]"
Explained :
$(tput setaf 1) set the color to red
\u is current user
\h is the host name
\W is the working directory
$(tput sgr0) reset the color to default again