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