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