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