One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,15)(8,12)(9,10)(11,14)(13,20)(16,19)(17,18)(21,22)(23,32)(24,33)(25,26)(27,34)(28,31)(29,36)(30,35)(1,3,4,2)(21,23,28,26)(22,25,31,32)(24,34,36,30)(27,33,35,29)(5,7,11,8)(6,12,14,15)(9,16,13,18)(10,17,20,19)(21,24)(22,29)(23,30)(25,35)(26,34)(27,32)(28,36)(31,33)(5,8,11,7)(6,12,14,15)(9,16,13,18)(10,19,20,17)(21,25,28,32)(22,23,31,26)(24,35,36,27)(29,30,33,34)(5,9,11,13)(6,10,14,20)(7,16,8,18)(12,17,15,19)(21,26,28,23)(22,25,31,32)(24,34,36,30)(27,29,35,33)(5,10)(6,13)(7,17)(8,19)(9,14)(11,20)(12,18)(15,16)(21,27,28,35)(22,30,31,34)(23,33,26,29)(24,32,36,25)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.