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