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