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