Graffiti number 8 is inside the dorm. Go to the second door (Number 105) on the right side of the start point and enter the room. Open the drawer in this room and read the journal inside the drawer. Leave the room and interact (erase option) with board beside the door. After that the graffiti option appears.
00:08 - Optional Graffiti #1 (Stagehandwriting)
00:44 - Optional Graffiti #2 (Radical Piratical)
01:39 - Optional Graffiti #3 (Feels on Wheels)
02:17 - Optional Graffiti #4 (Canon Wall)
02:45 - Optional Graffiti #5 (Wishlist)
03:23 - Optional Graffiti #7 (Tread Harshly)
03:53 - Optional Graffiti #6 (Friendly Forest Friends)
07:12 - Optional Graffiti #8 (Permanent Record)08:38 - Optional Graffiti #9 (Vanity Fare)
09:21 - Optional Graffiti #10 (Creature Feature)