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