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