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