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