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