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)(23,26)(24,27)(25,29)(28,32)(30,34)(31,35)(33,36) involution — undirected(2,3)(5,7)(6,10)(8,14)(9,15)(11,17)(12,13)(16,20)(18,19)(21,23)(22,26)(24,31)(25,30)(27,35)(28,33)(29,34)(32,36) involution — undirected(1,2,4,3)(5,8,9,16)(6,11,12,18)(7,14,15,20)(10,17,13,19)(22,27)(23,30)(24,32)(26,33)(28,29)(34,35)(6,12)(10,13)(11,18)(17,19) involution — undirected(1,3,4,2)(7,15)(10,13)(14,20)(17,19)(23,30)(26,34)(31,36)(33,35)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.