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