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)(21,22,25,28)(23,30,29,26)(24,31,33,32)(27,35,36,34)(5,7)(6,10)(8,14)(9,15)(11,17)(12,13)(16,20)(18,19)(21,23)(22,26)(24,32)(25,29)(27,34)(28,30)(31,33)(35,36) involution — undirected(5,8,9,16)(6,11,12,18)(7,14,15,20)(10,17,13,19)(21,24,25,33)(22,27,28,36)(23,31,29,32)(26,35,30,34)(7,15)(10,13)(14,20)(17,19)(21,22)(23,30)(24,27)(25,28)(26,29)(31,34)(32,35)(33,36) involution — undirected(1,3,4,2)(6,12)(10,13)(11,18)(17,19)(22,28)(23,29)(27,36)(31,32)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.