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