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