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