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)(11,16)(15,18)(17,20)(21,22,26,29,27,30,25,34)(23,31,32,35,33,36,24,28)(5,7,9,16,10,17,8,18)(6,11,12,14,13,15,19,20)(21,23,25,24,27,33,26,32)(22,28,29,31,30,35,34,36)(1,2,3,4)(5,6)(7,15)(8,19)(9,12)(10,13)(11,17)(14,18)(16,20)(5,8,10,9)(6,12,13,19)(7,16,17,18)(11,20,15,14)(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.