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)(9,13)(10,14)(11,17)(16,20)(18,19)(21,22,25,27)(23,29,32,36)(24,31,26,30)(28,34,35,33)(1,3,4,2)(5,7)(6,11)(8,16)(9,18)(10,17)(12,19)(13,20)(14,15)(22,27)(23,32)(30,31)(33,34)(5,8,10,9)(6,12,14,13)(7,16,17,18)(11,19,15,20)(21,23)(22,28)(24,33)(25,32)(26,34)(27,35)(29,30)(31,36)(5,9,10,8)(6,13,14,12)(7,16,17,18)(11,19,15,20)(21,23)(22,29)(24,34)(25,32)(26,33)(27,36)(28,30)(31,35)(6,14)(11,15)(12,13)(19,20)(21,24,25,26)(22,30,27,31)(23,33,32,34)(28,29,35,36)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.