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