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