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