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