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