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