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