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