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