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