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