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