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