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