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