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