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