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