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