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