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