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