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