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