The EU requirements about every site having to bug users with warnings about cookies are annoying, but unavoidable. Exactly what to do is not laid down as a black and white rule. There are lots of different interpretations about how to present the alert / warning / notification to users.
Out of research interest we've gathered a few examples of different websites' approach to abiding by the regulations.
Summary: Choose whether you are going to get your users to "Agree" to something or just "Dismiss" a notification. Providing a button to make the notice go away is probably the best way to help touchscreen users. Watch the wording to try to keep it polite, non-patronizing, and not verbose. Avoid channelling traffic off to "learn more" policy type pages unnecessarily. How prominent to make the message is probably determined by your site's actual use of cookies and, ethically speaking, how important you believe it is to put it in users' faces. Apparently a lot of sites still go without warnings at all, or the notification is passive and hidden away, and apparently nobody really sees anything wrong with that.