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