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