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