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)(21,22,27,24)(23,30,31,36)(25,29,26,35)(28,33,32,34)(5,7)(6,10)(8,14)(9,13)(11,17)(12,16)(15,19)(18,20)(21,23,25,33,27,31,26,34)(22,28,35,36,24,32,29,30)(2,4)(7,13)(10,16)(14,19)(17,20)(22,24)(23,31)(29,35)(33,34) involution — undirected(5,8)(6,11)(7,14)(9,15)(10,17)(12,18)(13,19)(16,20)(21,24,27,22)(23,32,31,28)(25,29,26,35)(30,34,36,33)(8,15)(11,18)(14,19)(17,20)(21,25,27,26)(22,29,24,35)(23,33,31,34)(28,30,32,36)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.