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