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