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