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