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