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