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