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