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)(13,15)(14,18)(16,19)(17,20)(22,28)(25,26)(29,30)(31,35)(32,36)(33,34) involution — undirected(5,6)(7,13)(8,11)(9,12)(10,15)(14,19)(16,18)(17,20)(21,22)(23,32)(24,29)(25,28)(26,35)(27,31)(30,33)(34,36) involution — undirected(2,4)(5,7,9,15)(6,10,12,13)(8,16,17,14)(11,19,20,18)(21,23,27,24)(22,29,31,32)(25,34,26,33)(28,30,35,36)(5,8,9,17)(6,11,12,20)(7,14,15,16)(10,18,13,19)(21,24,27,23)(22,30,31,36)(25,34,26,33)(28,29,35,32)(6,12)(10,13)(11,20)(18,19)(21,25,27,26)(22,28,31,35)(23,33,24,34)(29,36,32,30)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.