Shermy, I have a image of the same tank you have posted here, a Grant of "3" troop, "A" squadron of the 1st Armoured Division, a division which fought at the Battle of Gazala, but I don't have a date for this particular paint sceme. The two images I do have of Grants at Gazala, the first of which is from the 1st Armoured Division, shows them in overall Desert Yellow.
My info is kind of sketchy here, but it is possible that these two scemes existed simultaneously. In one of my books, it shows a knocked-out Grant with the 4 color sceme of large areas of Desert Yellow and Olive Green, outlined with thin bands of black and white, which appears in the chapter on the Battle of Gazala, but who knows if the picture was actually taken there?