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