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