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