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