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