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