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