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