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