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