How to do like this?

Hello,

I want a plugin or something which will automatically update sitemap in a page after writing a post or page.
For example look this: http://www.healthyfoodstyle.com/sitemap/

And I want to add like this in my site. Can I add in my site? This is my site: http://www.onlineaskblog.com

I want that all pages and all posts will update in a Sitemap page.

Thanks.