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