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