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