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