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