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)(21,22,26,31)(23,29,33,36)(24,28,34,35)(25,32,27,30)(1,2)(3,4)(5,7,9,8)(6,10,11,12)(13,15,17,16)(14,18,19,20)(21,23,25,24,26,33,27,34)(22,28,30,29,31,35,32,36)(2,4)(13,16,17,15)(14,18,19,20)(21,23,27,34,26,33,25,24)(22,28,32,36,31,35,30,29)(5,8,9,7)(6,10,11,12)(21,24,25,33,26,34,27,23)(22,29,30,35,31,36,32,28)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.