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