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