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