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