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