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