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)(13,14)(15,19)(16,18)(17,20)(21,22,25,28,24,26,31,33)(23,27,30,34,29,32,35,36)(5,7,9,6)(8,11,12,10)(13,15)(14,17)(16,20)(18,19)(22,26)(23,29)(28,33)(30,35)(1,2,4,3)(5,8,9,12)(6,10,7,11)(15,20)(17,19)(21,23)(22,27)(24,29)(25,30)(26,32)(28,34)(31,35)(33,36)(1,3,4,2)(6,7)(10,11)(14,18)(15,20)(23,29)(27,32)(30,35)(34,36)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.