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