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