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