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