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