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