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