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