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