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