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