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