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