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