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