It may be camouflaged to the red rock shown in the picture. Was there red soil in the vicinity. Many grasshoppers are able to change colour during development to match background, i.e black grasshoppers in burnt areas.
In the past I have seen some dense populations of this species which contained many colour morphs - the usual brown or green, but also red like this and/or striped in green/cream, red/cream, black/cream etc.