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