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