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