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