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)(23,31)(24,29)(25,27)(26,30)(28,34)(32,35)(33,36) involution — undirected(5,7)(6,11)(8,15)(9,18)(10,16)(12,19)(13,14)(17,20)(22,27)(23,32)(24,34)(26,33)(28,35)(29,31) involution — undirected(1,2,3,4)(21,23,33,24,25,34,26,32)(22,28,36,35,27,31,30,29)(5,8,10,9)(6,12,13,17)(7,15,16,18)(11,19,14,20)(22,27)(28,31)(29,35)(30,36)(5,9,10,8)(6,12,13,17)(7,15,16,18)(11,20,14,19)(21,24,33,34,25,32,26,23)(22,29,36,28,27,35,30,31)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.