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