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