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