Different color settings not working

[sriramkandukuri]

Hi,

I have a different color schemes for diff mode and non diff mode as below.

if &diff
    hi DiffAdd guibg=#0f3f0f
    hi DiffChange guibg=#3f2f0f
    hi DiffDelete guibg=#3f0f0f guifg=#ff9ff0
else
     hi DiffAdd guibg=#8fff33 guifg=#0f0f0f
     hi DiffChange guibg=#fff009 guifg=#0f0f0f
     hi DiffDelete guibg=#fe0808 guifg=#f0f0f0
endif  

Colors are not reflecting in diff window even diff is enabled.

Thanks & Regards,
Sriram.K