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