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