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