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