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