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