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