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