There are two VIM syntax files contributed:

pacemaker-crm.vim
pcmk.vim

Neither matches colours used in crm configure show and both need
to be improved. Still, you may want to edit a more colorful
configuration. To have that in "crm configure edit" do the
following:

Copy one of them to ~/.vim/syntax/pcmk.vim.

Don't forget to put "syntax on" in the VIM rc file (~/.vimrc or
~/.exrc).

If you're editing a file directly, just type:

:setf pcmk

Many thanks to the contributors:

Trevor Hemsley <themsley@voiceflex.com>
Dan Frincu <df.cluster@gmail.com>
Lars Ellenberg <lars@linbit.com>