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