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