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