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