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