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