One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6,11,9)(7,12,18,17)(8,14,19,13)(10,20,16,15)(21,22,27,26)(23,30,25,28)(24,29,34,33)(31,36,32,35)(1,2,4,3)(5,7,11,18)(6,12,9,17)(8,16,19,10)(13,20,14,15)(21,23,27,25)(22,28,26,30)(24,32,34,31)(29,36,33,35)(5,8)(6,13)(7,16)(9,14)(10,18)(11,19)(12,20)(15,17)(21,24,27,34)(22,29,26,33)(23,31,25,32)(28,35,30,36)(5,9,11,6)(7,17,18,12)(8,14,19,13)(10,20,16,15)(21,25,27,23)(22,30,26,28)(24,32,34,31)(29,36,33,35)(1,3,4,2)(5,8)(6,14)(7,16)(9,13)(10,18)(11,19)(12,15)(17,20)(21,26,27,22)(23,30,25,28)(24,33,34,29)(31,36,32,35)(5,10,11,16)(6,15,9,20)(7,8,18,19)(12,13,17,14)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.