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