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