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