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