I designed a simple board in EagleCAD. The 7 LEDs are connected in parallel. A JST connector connects directly to power and ground. A slide switch goes in between the JST and first LED to act as an On/Off switch.
Here's a quick breakdown of the board dimension (case you're interested).
If you're interested in making the board yourself, but don't have access to a CNC mill, you could send it to a PCB service such as OSHPark.com