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