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