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