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