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