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