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