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