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