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