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