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