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