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