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