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