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