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