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