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