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