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