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