The short answer is ‘no’, and there are good reasons why cumulative is the right choice for goals.
(there was an excellent blog post about this, does anybody remember where it is? paging @dreev!)
But I too sometimes want to easily see the daily pattern of data.
One workaround: on the data tab of your goal, near the bottom you can download a csv of your data, open it in Excel and create whatever graphs make sense.
One of my hopes for client-side graphs (whenever that becomes possible) is that we’ll then be able to support toggling between the current cumulative graph and a daily histogram.