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