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