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