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)(13,17)(14,18)(15,19)(16,20)(21,22)(23,27)(24,26)(25,28)(29,32)(30,35)(31,33)(34,36) involution — undirected(5,7,9,14)(6,10,12,18)(8,15,16,13)(11,19,20,17)(22,26)(23,30)(24,32)(27,34)(28,29)(33,35)(2,4)(5,8,9,16)(6,11,12,20)(7,13,14,15)(10,17,18,19)(21,23,25,30)(22,27,28,35)(24,31,32,36)(26,33,29,34)(6,12)(10,18)(11,20)(17,19)(22,28)(26,29)(27,35)(33,34) involution — undirected(23,30)(27,35)(31,36)(33,34) 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.