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