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