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)(21,22,25,27)(23,31,33,36)(24,30,26,29)(28,34,35,32)(2,3)(5,7)(6,10)(8,14)(9,15)(11,18)(12,13)(16,19)(17,20)(22,27)(28,35)(29,30)(31,36) involution — undirected(1,2,4,3)(21,23)(22,28)(24,32)(25,33)(26,34)(27,35)(29,31)(30,36)(5,8,9,17)(6,11,12,16)(7,14,15,20)(10,18,13,19)(22,27)(28,35)(29,30)(31,36)(1,3,4,2)(7,15)(10,13)(14,20)(18,19)(21,24,25,26)(22,29,27,30)(23,32,33,34)(28,31,35,36)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.