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