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