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