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