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