If you install the PS Auto Site Map plugin (free from the WordPress free plugins directory: wp-admin/plugins/add-new) you can display your site html sitemap in this page. You will need to replace this instruction text with the code snippet from your PS Auto Sitemap plugin settings panel. Be sure to use the HTML editor mode when inserting the code snippet into the page editor.
Edit this page in wp-admin/pages/Sitemap
You also need to edit the settings of your PS Auto Sitemap plugin to suit your own sitemap display requirements.