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