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