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