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