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