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