Colored hair seems to be greasier than prior to coloring.?

Last Thursday I got my hair colored for the first time in just over two years. On Monday evening I finally washed it for the first time over a week; I wash it about once a week. Today is just Thursday and it feels greasy already. I didn't really do anything to it on Tuesday, just wet my fingers and fluffed it at the roots as it still looked good. Yesterday, I sprayed it with vinegar and brushed it and it just looked flat, which it used to not really do. Today, it still looks flat and greasy. I tried to cover it from the rain yesterday morning and this morning with a nylon hood, but the hair escaped from the sides. Usually, to fluff it up between washings, I wet it, spray it with the vinegar/water spray and a bit of hair spray before brushing it. When it dries, I brush it again. I would like something less high maintenance. (Any suggestions on what to do other than that? There seems to be several mothers at my son's school who look as though they roll out of bed with low maintenance hair and minimal makeup. I hate to admit that I'm jealous, but I kinda am.)

Today, I'm just going to pick up my son from preschool, so I don't really plan on "pretty-ing" myself up much. However, I just wonder if this is common as I don't recall it happening in the past. I'm thinking about getting up early tomorrow just to shower. I don't want to shower often as it's not good for the hair. Thank you.