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