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