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