How can I graphically monitor web access from a soho network

I’ve got a network comprising 4 wired computers, 3 wireless computers and a number of mobile wireless devices. Each of these devices has a fixed ip address within the network. What I want to be able to do, is to produce a graphical representation of each devices broadband access over the last minutes/hours, and be able to drill down to each device’s list of websites being accessed.

Any suggestions on what software can do this? And what hardware configuration I need to have?