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