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