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