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