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