First of all congratulations on your degree, from a fellow (almost) CS'er!
Do I need to have work related hobbies in order to show how much passion I have in the field
I would say not really. If you can speak to the passion about your hobbies, whatever they are, effectively a potential employer will be able to see that you have passion for what you're doing. Writing code, travel, golf, whatever. I think having other hobbies is a positive to being social too. Especially when you have to work with non developer business units. The best gauge of your technical acumen is of course going to be your work.
If you're in the US, there's been a lot of buzz about the top tech firms and their lack of diversity. This isn't a function of Google not wanting to hire women, but as a society we (the US) has an unfortunate way of discouraging women from STEM fields, it's getting better fortunately. To put the gender divide in a positive light, IT firms are eager to hire qualified women (and other minorities) because a diverse workforce can draw upon multiple perspectives and create better solutions.