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