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