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