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