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