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