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