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