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