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