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