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