I'm not a stylist or colorist, but have a question and possible suggestion.
What color is your hair? Is it dark?
If your hair is dark, what you can do is to start coloring it lighter. The lighter shades don't cover the grey as much (at least not my grey) but it colors it a bit - which translates to lighter highlights (in my hair at least).
My hair is naturally darkest brown (this >< close to black) and my grey is a pretty silvery grey. I'm still 50/50 though and I don't like the look of "salt and pepper". So I color my hair with a softer brown (Loreal Preference #6 1/2 G) which has gold (not red) highlights. The gold highlights are picked up well by my grey. I recently went without coloring for much longer than I care to admit (or remember) and other than the 50% dark hair in my roots - the 50% grey hair in my roots was not as noticeable.
I would caution against using a color with red highlights though as the red tends to turn the grey FUSCIA!! Yeah ... ask me how I know!!