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