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