Shift register on a schematic
For simulation puropses, XMPPWocky's answer is good - you need to either make it from components available in CircuitLab or if you were using SPICE you would probably use a macro model (or possibly subcircuit) to describe the behaviour.  

However, if you are wanting to draw a proper schematic and possibly produce a PCB, then getting hold of a proper EDA package to produce the schematic, board layout, gerber files, BOM, etc is a good idea. Some EDA packages incorporate simulation also.
In software of this type you would typically either download the manufacturers symbol and footprint for the component, or if they are not available in your format, you would create them youself. They may already be present in the library of you package, some have very extensive component libraries.

In an typical schematic, the symbol would look something like this:



The PCB footprint might be like this:



And some packages have a 3d view which will look something like this:



There are many good EDA packages out there, ranging from expensive (e.g. Altium) to more affordable (Diptrace, Eagle) to free (Kicad, GEDA) For a very good free option which is quite useable for professional purposes, Kicad is well worth trying out (the above images are from Kicad).
Like any complex design tool, it has a steep learning curve, but it's well worth the time if you intend to catalog and produce your designs in the future.