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