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