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