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