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