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)(11,15)(16,19)(17,20)(21,22,24,28,25,27,29,35)(23,26,31,34,30,33,32,36)(5,7,8,17,10,16,9,15)(6,11,18,19,13,20,12,14)(21,23,29,31,25,30,24,32)(22,26,28,36,27,33,35,34)(2,4)(5,6)(7,11)(8,18)(9,12)(10,13)(14,15)(16,20)(17,19) involution — undirected(5,8,10,9)(6,12,13,18)(7,15,16,17)(11,19,20,14)(23,30)(26,33)(31,32)(34,36)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.