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