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