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