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