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