You will need to edit the contact form within the contact form editor.
You can use html and css to create forms..
HTML CODE:
<div id="contact_form">
<p><label for="name">Name</label>[your-name name]</p>
</div>
CSS CODE:
#contact_form label, #contact_form input[type="text"]{
float:left;
margin-right:5px;
}
This is just to get you started. This would be placed in the contact form 7 form editor. the CSS will be placed in the style sheet file.