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