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