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