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