Yeppie... I got it too
To enable directory listing
PART-I
======
1) Navigate to folder "/etc/httpd/modsecurity.d/"
2) Open the file "modsecurity_crs_10.conf" in your favorite text editor.
3) Search for the line "SecResponseBodyAccess On", change it to "SecResponseBodyAccess Off"
4) Save the file and exit.
5) Open the file "/etc/httpd/conf.d/welcome.conf"
6) Comment out the line "Options -Indexes"
PART-II
=======
I have my virtualhost declarations in "/etc/httpd/conf.d/system-config-httpd.conf"
Alternatively you may find it in "/etc/httpd/conf/httpd.conf"
1) Add the following lines in your Virtualhost declaration
<Directory "/path/to/web_directory/">
Options Indexes
</Directory>