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