First, you want to start by drawing 6 vertical lines. Three on the top and 3 on the bottom. Keep in mind they don't have to be perfect.
Keep in mind throughout this tutorial that your lines don't always have to be straight.
Second, you want to draw two diagonal lines that connect the 1st (top) line to the 2nd (bottom) line and one that connects the 2nd (top) line to the 3rd (bottom) line.
Now you want to draw an upside down half triangle that meets on the top and bottom of the S.
Finally, draw two diagonal lines (as shown in the purple) to give it a closed effect.
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