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