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