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