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