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