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