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