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