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