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