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