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