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