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