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