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